We are upgrading our Hedera Mainnet infrastructure to Hedera Mirror Node v0.164.0 on 2026-10-08. This release contains multiple security fixes (dozens of gaps closed), along with enhancements to REST API endpoints for contract results and improved gas estimation accuracy. Brief interruptions to RPC availability may occur on that date.
RPC Changes: /api/v1/contracts/{contract}/results/{timestamp} — Now includes synthetic contract results, making synthetic contract logs generated for non-EVM transfers searchable on this single-item lookup endpoint. /api/v1/contracts/results/{id} — Now includes synthetic contract results consistently with other contract result list endpoints. /api/v1/contracts/results — Non-wildcard synthetic contract results are now included consistently across all contract result list endpoints. Gas estimation — Accuracy improved with fixes to gas estimate calculations in web3 queries.